The paved circle was still visible when we visited in year 2000. Also the tombs were visible as mounds, but covered in grass. Some farmer grazed his cows there, so maybe he filled over the paving in the intervening years.

If you type “Sad Hill Cemetery” on Google Maps it takes you straight to it. The last time I visited the place there were no road signs, but i know they are planning to put some soon. You shouldn’t have any trouble finding the place!